In the year that I have been associated with this forum I have heard many reasons cited as a possible cause for nose wheel shimmy.  All have been interesting and worth checking.  However I ran across something in service bulletin No. 61 that has to my knowledge not yet been mentioned.  Maybe something new to look at.
In paragraph 2.a it discusses the pins that attach the outer cylinder  bearing and it's lower bushing and the outer cylinder and its attaching collar.  It states that these pins have a tendency to become worn and elongated by the loads imposed on them thereby making the strut loose, contributing to Shimmy and additional wear.  Looks like a lot of work to check these,  however if everything else has been checked, what's left?
 

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